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GATE CSE 2026 Session 2 Q7: Missing tiles in a dot-pattern grid

Question

Two tiles are missing in Panel I. Which one of the options in Panel II is the appropriate choice for the missing tiles?

Panel I is a 3 by 3 grid of tiles with nine black or white dots each, two tiles in the last column missing; Panel II shows four pairs of tiles labelled (i) to (iv)
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Try it: multiple choice: exactly one correct option

Select one option
Wrong answer costs 2/3 mark in GATE.
Show answer and explanation

Answer: A (official GATE 2026 final answer key)

Concept used: Pattern completion: find the rule that relates the tiles along each row and column.

First step: Compare how the black dots change from the first to the second tile in each row, and apply the same change to the third column.

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Source: official GATE 2026 Session 2 CS question paper and final answer key, organised by IIT Guwahati. Question paper · Answer key

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